<HTML><HEAD><TITLE>length_queue(Queue, Length)</TITLE>
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<H1>length_queue(Queue, Length)</H1>
counts the number of elements currently in the queue
<H2>Description</H2>

    counts the number of elements currently in the queue.  Note that
    we have to be careful in checking for the end of the list, we
    can't test for [] the way length(List) does.
    

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